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General E46 Forum
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Old 01-17-2015, 03:09 AM   #1
agwright1183
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Connecting rod bearing mayhem! Video, Pictures, with question...

So, in an effort to not leave a story without an ending. Here goes. For those that missed it, here is the original post with video of my engine problem.

http://forum.e46fanatics.com/showthr...382&highlight=

Fast forward a few months, got the garage cleaned out enough to fit the car in the garage along side the boat, and started tearing in.

Pictures!!! http://imgur.com/a/7zDtn

Pretty fun seeing the bottom side of the motor, though I would have never guessed I would find the rod bearing in this condition. Completely welded/spun itself together. There was never any indication of a spun bearing, no squeal or screech. This progressed from a light tap to the knock you see in the video.

Now to the question. After plastigauging the new bearing and installing/torquing, I moved on to the next bearing. Comparatively it looked brand new. I can tell by looking at the condition of the rod caps that the rest more than likely will look the same. Question is, is there any reason to leave the rest of these bearings alone? They have made it 200,000+miles and look great, but it would be ridiculous to not replace them at this point correct?
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Old 01-17-2015, 03:52 AM   #2
Megalocnus
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Oil starvation at that particular rod bearing?
Not sure if just one lubrication passage or sprayer can get clogged, but there's a possibility.
Did you have a chance to take a good look for any tell tale signs before reinstalling the cap with new rod bearing?
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Old 01-17-2015, 07:30 AM   #3
bmwbob89
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From what I can see of the picture of the crankshaft it is junk. That surface has to have a polished mirror finish. Get a used motor.
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Old 01-17-2015, 07:47 AM   #4
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It also looks like that part of the crankshaft has been overheated due to the coloration near the rod journal?? Might be the picture??

At a minimum if you want to salvage, reassemble this engine, I would manually polish the crank journal with emery cloth wrapped around the journal and then use string or a shoelace wrapped around the emery cloth to help with the polishing. Search YouTube and I am sure you can find a video of someone doing this..

It is not precision, but is it MUCH better than leaving the crank as it is.

Anything you can do to improve the situation is worth investing a few more minutes before you reassemble everything.

Might not be ideal, but far better than a spun rod bearing!!

You would be surprised what you can keep running without exacting tolerances. I would not plan on tracking the car in the future if you get it back together.
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Old 01-17-2015, 08:17 AM   #5
bmwbob89
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Big waste of time and money. Crank is junk. Get a used engine. That engine is nothing more than an boat anchor at this point. It obviously was run without oil at some point.
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Old 01-17-2015, 08:50 AM   #6
jfoj
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Might be a waste of time and money, however, the oil pan is off, he has parts, so he might as well try for a 2nd chance.

2 things will happen.

1. He will be reasonably successful and as long as the car is not driven hard, there might be quite a few good miles left in the engine.

2. He will be unsuccessful, rod bearing will fail again and engine will need to be replaced.

If number 1 works out, no harm, no foul as he is already into the engine.

If number 2 happens, well he knows what the next step will be.
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Old 01-17-2015, 09:29 AM   #7
dknightd
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Quote:
Originally Posted by bmwbob89 View Post
From what I can see of the picture of the crankshaft it is junk. That surface has to have a polished mirror finish. Get a used motor.
or a new crankshaft
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Old 01-17-2015, 10:21 AM   #8
lszlszx
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Put it back together, don't worry about the rest of the bearings.
It may last for a while.

1999 323i? How is the rest of the car? Maybe a better idea to get a newer car, instead of motor swap.
Swapping in a larger engine sounds attractive, but there aren't many used 2.8L available.
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Old 01-17-2015, 10:55 AM   #9
dknightd
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Originally Posted by lszlszx View Post
Put it back together, don't worry about the rest of the bearings.
It may last for a while.

1999 323i? How is the rest of the car? Maybe a better idea to get a newer car, instead of motor swap.
Swapping in a larger engine sounds attractive, but there aren't many used 2.8L available.
Could be good advice. Depends what you plan for the future, and your finances.

For a low buck temporary thing - I'd smooth the crank as best as possible where it was spun. You've already got the parts. Might as well put it back together. See what happens. Plan to replace something (crank, engine, car) in the near future. There is a learning experience hidden here someplace.
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Old 01-17-2015, 11:07 AM   #10
Patton323I
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Yeah, definitely polish up that crank as best as you can. I had a Toyota SR5 pickup with the 22RE engine that did the same thing. I just changed the rod bearings and cleaned up the crank and the damn thing ran for the rest of the time I owned it. These engines are stronger than most people think. And they do make rod bearings that are a little thicker for situations just like this. I bet if you take your time and clean it up well, the engine will run fine with no other (related) problems!
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